The relationship between STILLEN and Infiniti has been a long and successful venture. With over 30 years’ experience installing and developing Infiniti aftermarket parts, you can trust that the STILLEN team with your Infiniti Q50. We provide the highest quality Infiniti Q50 performance parts that are currently available. This includes catalytic converters, performance exhaust systems, intakes, clutch kits, and more. We manufacture our own line of Infiniti Q50 performance parts complimented with other top Infiniti Q50 performance part manufacturers including AP Racing by STILLEN Big Brake Kit, RS-R, Injen, H&R and ARK Performance.